Writing instrument



FIG. 1 is a top plan view of a writing instrument showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view with the top portion rotated to a position wherein the clip may be engaged and the writing point retracted; and

FIG. 7 is a left side elevational view thereof. 

The ornamental design for a writing instrument, as shown and described. 